Doesnt let me enter a page or even scroll.

2021.05.16 added. It does not work with Firefox V88.0.1 and abnormally terminates Firefox. Please fix it as soon as possible.
Originally reviewed:
QiuReader is the best application for epub books.
Please allow me to use four arrow keys to transit pages instead of mouse scroll.

Doesnt working with any of my epubs. After select epub from disc show it at main menu, but when launch it, nothing appear.